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Re: 2.5 or 3" exhaust? 68 dart 360 [Re: pinkduster] #1398722
03/08/13 09:54 PM
03/08/13 09:54 PM
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
racealittle Offline
pro stock
racealittle  Offline
pro stock

Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
When I bought my 1974 360 Challenger it had 3" pipe and flowmasters off the headers. It was loud, and gutless. I bought one of the Jegs $200 mandrel bent exhaust kits with mufflers in the 2.5" size. The car picked up quite a bit and sounded better out of the exhaust tips.

I am lowering the car, removing the headers, and putting '70-'71 high flow factory exhaust manifolds on it. I will make up the required pipe to join up to the Jegs setup and will likely add a set of electic cutouts for fun (that might exit something like the T/A pipe).


Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
Re: 2.5 or 3" exhaust? 68 dart 360 [Re: racealittle] #1398723
03/09/13 01:52 AM
03/09/13 01:52 AM
Joined: Feb 2003
Posts: 1,238
Nevada
D
dezduster Offline
pro stock
dezduster  Offline
pro stock
D

Joined: Feb 2003
Posts: 1,238
Nevada
I have TTI headers, had tti 2.5 H pipe set up on my duster with the 340 that went to dynomax mufflers. I swapped the 2.5 H pipe for a 3.0 DrGas X pipe when I went to the 422 stroker, that goes into "the hated flomaster delta flows" it drops back to the 2.5 after the mufflers and out the tti tail pipes to the bumper.
I like the flow masters, most on here dont. As for too loud its as quiet now as it was before, cruise wise anyway. Its not to loud while your on it and mellows quickly from behind as its driving away.

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: dezduster] #1398724
03/09/13 08:25 AM
03/09/13 08:25 AM
Joined: Jan 2003
Posts: 11,071
Berlin, N.J.
A
abodyjoe Offline
I Live Here
abodyjoe  Offline
I Live Here
A

Joined: Jan 2003
Posts: 11,071
Berlin, N.J.
Had 3" pipes with x-pipe and the larger 3" dynomax super turbo mufflers with 3" tail pipes to the bumper of my dart.. With the good 360 (low 12 sec. In the quarter.) Car was nice and quiet inside, no drones. Loved it.... Spun a bearing in it and put a stock 360 in it and it ran great with they big exhaust.... I wouldn't be scared of 3" exhaust with a stock motor especially if your upgrading down the road....

I have seen a couple articles saying like stated already. 3" to the muffler and 2.5" tail pipes.. It's supposed to keep the gasses flowing quickly. But who knows. Not sure if they take bends in the pipe in to account though... Not sure if anyone has done any real testing on it.. Be an interesting article for one of the magazines.


It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

www.MoparMisfits.com
Re: 2.5 or 3" exhaust? 68 dart 360 [Re: abodyjoe] #1398725
03/09/13 09:35 AM
03/09/13 09:35 AM
Joined: Nov 2004
Posts: 6,653
Near Reading PA USA
pinkduster Offline
master
pinkduster  Offline
master

Joined: Nov 2004
Posts: 6,653
Near Reading PA USA
Car Craft Magazine did extensive exhaust system testing on their "Project Chevelle" several years ago. I don't know if the information would be on their website.

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: GTSDart340] #1398726
03/09/13 11:25 AM
03/09/13 11:25 AM
Joined: Oct 2005
Posts: 4,935
WI
Dcuda69 Offline
master
Dcuda69  Offline
master

Joined: Oct 2005
Posts: 4,935
WI
Well...if you're doing the 408 I would do the 3". I have 3" on my 69 B'cuda....I have no idea why some of these guys say it will be so much louder than the 2.5"?? Use some good pieces like TTI,absolutely use tailpipes(no turn downs)an X-pipe and pick your mufflers wisely(no Flowmaster 40's)Mine is more than reasonably quiet(meaning you can talk without yelling) at highway speeds but it has a nice growl when you mat it!!

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: Challenger 1] #1398727
03/09/13 11:39 AM
03/09/13 11:39 AM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
I Live Here
justinp61  Offline
I Live Here

Joined: Oct 2003
Posts: 11,678
W. Kentucky
Quote:

3" is just silly for a 408, even more stupid for a 360 in a dart!!

You guys are a riot.




Call me silly. I get a kick out of some of your stuff too .

My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.

The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: justinp61] #1398728
03/09/13 11:51 AM
03/09/13 11:51 AM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

Quote:

3" is just silly for a 408, even more stupid for a 360 in a dart!!

You guys are a riot.




Call me silly. I get a kick out of some of your stuff too .

My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.

The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.




He said his was street car, not a race car. 3" system is heavier than a 2.5" pipe. A dart is a smaller car than my challenger with 3" and it's tight under my E body. I don't care for my 3" X pipe TTI system and my 2.5" H pipe TTI pipes sound way better than the 3" X pipe, way better. I have BB in my 3" car, not a little wimpy 408.

Bigger is not always better is my point, especially for street car. Been there, done it.

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: Challenger 1] #1398729
03/09/13 12:07 PM
03/09/13 12:07 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
I Live Here
justinp61  Offline
I Live Here

Joined: Oct 2003
Posts: 11,678
W. Kentucky
Quote:

[He said his was street car, not a race car. 3" system is heavier than a 2.5" pipe. A dart is a smaller car than my challenger with 3" and it's tight under my E body. I don't care for my 3" X pipe TTI system and my 2.5" H pipe TTI pipes sound way better than the 3" X pipe, way better. I have BB in my 3" car, not a little wimpy 408.

Bigger is not always better is my point, especially for street car. Been there, done it.




Mines a street car too. What does the bad big block Challenger run? 8.20?

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: justinp61] #1398730
03/09/13 12:18 PM
03/09/13 12:18 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

Quote:

[He said his was street car, not a race car. 3" system is heavier than a 2.5" pipe. A dart is a smaller car than my challenger with 3" and it's tight under my E body. I don't care for my 3" X pipe TTI system and my 2.5" H pipe TTI pipes sound way better than the 3" X pipe, way better. I have BB in my 3" car, not a little wimpy 408.

Bigger is not always better is my point, especially for street car. Been there, done it.




Mines a street car too. What does the bad big block Challenger run? 8.20?




I have no idea what it runs because I have never taken it to the drag strip. Even a 10 second ride is not exciting to me anymore on the track. On the street is totally different story. Now it's about cruising in a reliable muscle car for me.

My 440 has eddie heads on it and a 6 pak. It'll smoke my 12" wide mickeys at 35 MPH roll.

I just got a go pro camera for Xmas and wanted to use it today but it is still too salty on the streets. I've been downtown and to work already today on separate trips checking out the streets because it's going to be 55 today and the rest of the snow will melt. It's gonna have to wait. My cars are no slouches but I'm not claiming to have the fastest car.


Re: 2.5 or 3" exhaust? 68 dart 360 [Re: pinkduster] #1398731
03/09/13 12:54 PM
03/09/13 12:54 PM
Joined: Jan 2003
Posts: 74,904
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,904
U.S.S.A.
Quote:






you should have stayed with this post only ...

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: JohnRR] #1398732
03/09/13 04:54 PM
03/09/13 04:54 PM
Joined: Nov 2004
Posts: 6,653
Near Reading PA USA
pinkduster Offline
master
pinkduster  Offline
master

Joined: Nov 2004
Posts: 6,653
Near Reading PA USA
Quote:

Quote:






you should have stayed with this post only ...




YEAH, I know! All this talk about pea-shooter sized exhaust is quite entertaining though.

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: Challenger 1] #1398733
03/09/13 09:25 PM
03/09/13 09:25 PM
Joined: Jan 2007
Posts: 401
Ohio, USA
Dr-Dave2 Offline
mopar
Dr-Dave2  Offline
mopar

Joined: Jan 2007
Posts: 401
Ohio, USA
The DynoMax tech section has some good information about calculating exhaust diameter based on C.I,D. and horse power
seems like muffler selection is also a factor in their calculations
http://www.dynomax.com/assets/2012catalog_pdf/2012_Dynomax_techsection.pdf

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: justinp61] #1398734
03/11/13 04:47 PM
03/11/13 04:47 PM
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
D
DPelletier Offline
I Live Here
DPelletier  Offline
I Live Here
D

Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
Quote:

Quote:

3" is just silly for a 408, even more stupid for a 360 in a dart!!

You guys are a riot.




Call me silly. I get a kick out of some of your stuff too .

My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.

The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.





I bet those crappy flowing Flowmasters cost you far more restriction than the 2.5" pipe does/did


Dave


1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]
Re: 2.5 or 3" exhaust? 68 dart 360 [Re: DPelletier] #1398735
03/11/13 07:21 PM
03/11/13 07:21 PM
Joined: Jan 2005
Posts: 4,366
Michigan
MarkZ Offline
Worthy
MarkZ  Offline
Worthy

Joined: Jan 2005
Posts: 4,366
Michigan
Quote:

Quote:

Quote:

3" is just silly for a 408, even more stupid for a 360 in a dart!!

You guys are a riot.




Call me silly. I get a kick out of some of your stuff too .

My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.

The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.





I bet those crappy flowing Flowmasters cost you far more restriction than the 2.5" pipe does/did


Dave




Agreed! Despite the name those things flow like there is a potato stuck up the pipe. For as much back and forth as there is regarding pipe size in this thread, muffler choice is probably more critical than 2.5" vs 3" for these power levels.


Last edited by MarkM; 03/11/13 07:24 PM.

1987 Fifth Avenue - 512/518/D60
Re: 2.5 or 3" exhaust? 68 dart 360 [Re: MarkZ] #1398736
03/12/13 09:23 AM
03/12/13 09:23 AM
Joined: Jan 2003
Posts: 5,892
Florida
Locomotion Offline
master
Locomotion  Offline
master

Joined: Jan 2003
Posts: 5,892
Florida
FWIW, years ago, after a few years of tuning with collectors, I added a 3" TTI X-pipe and Dynomax UltraFlow mufflers to their step headers on my 360 IHRA Stocker. I picked up between .05 and .10 in ET right off the bat. A number or two leaner on jetting also helped.
I figure the X-pipe helped and the Dynomax mufflers didn't hurt.

Re: 2.5 or 3" exhaust? 68 dart 360 [Re: Dr-Dave2] #1398737
03/12/13 10:07 AM
03/12/13 10:07 AM
Joined: Jan 2003
Posts: 338
Montreal Quebec
STROKIE Offline
enthusiast
STROKIE  Offline
enthusiast

Joined: Jan 2003
Posts: 338
Montreal Quebec
Quote:

The DynoMax tech section has some good information about calculating exhaust diameter based on C.I,D. and horse power
seems like muffler selection is also a factor in their calculations
http://www.dynomax.com/assets/2012catalog_pdf/2012_Dynomax_techsection.pdf




As per DynoMax tech piping chart about horsepower.
It is brake horsepower or rear wheel horsepower.
Big difference...
My engine is a 451 with 373 RWH and I use 3.00 may be It's too big.

7622954-TTI2.JPG (210 downloads)
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